Table 1.

Participant characteristics.

	Male participants				Female participants				Test statistic
	M	SD	Min	Max	M	SD	Min	Max	F(1,74)/F(1,59)	p	η p 2
Age	26.49	4.58	18	35	25.81	3.61	20	34	0.508	0.478	0.007
Heart rate variability
Log-HF-HRV-300	2.71	0.54	1.23	3.75	2.79	0.41	1.71	3.65	0.528	0.470	0.007
Log-HF-HRV-120	2.76	0.59	1.17	4.12	2.82	0.46	1.93	3.82	0.260	0.611	0.004
Log-HF-HRV-60	2.85	0.60	1.20	4.03	2.86	0.42	1.95	4.12	0.007	0.936	0.000
Social value orientation
SVO anglea	32.83	11.05	0.00	61.39	32.00	10.89	−3.81	50.83	0.108	0.743	0.000
IA indexb	0.31	0.32	0.05	1.00	0.11	0.11	0.00	0.43	10.370	0.002**	0.149

Note. Log-HF-HRV-300 = log-transformed high frequency heart rate variability derived from short-term HR recordings (300 s), Log-HF-HRV-120 = log-transformed high frequency heart rate variability derived from ultra-short-term HR recordings (120 s), Log-HF-HRV-60 = log-transformed high frequency heart rate variability derived from ultra-short-term HR recordings (60 s), SVO angle = Social Value Orientation angle³⁶, IA Index = Inequality Aversion Index³⁶.

^aData on SVOA angle was available for 76 participants, 37 females and 39 males.

^bData on IA index was only available for 61 participants, 30 females and 31 males because these were the only participants that met the conditions for the determination of the IA index³⁶.

**p ≤ 0.01.